Bonjour,
a = 1/5
c= 2/9
d= 1/7
Exercice 5
a)
-4-5 = -9
5-6 = -1
=> -9/-1 = 9
b)
-21 *+21= -441
-13 - 68 =- 81
=> -441 / -81 = 441/81 = 49/9
